Cotter-pin puller



Dec. 1925.

1,563,840 H1; D. @mms COTTER Pm FULLER Filed Sept. ll, 1924 51m/vanto@ el kton/sett! Patented Dec. l, 1925.

UNITED STATES HENRY D. DIRKS, OF MARION, IOWA.

corren-PIN PULLER.

`Application filed September 11, 1924.

To all whom t may concern.'

Be it known that I, HENRY D. DIRKs, a citizen ot the United States, residing at Marion, in the county of Linn and State of Iowa, have invented certain new and useful Improvenients in Cotter-Pin Fullers, of which the following is a specification.

This invention relates to hand tools tor use in garages, and the object of the invention is to produce a tool adapted for the quick and convenient extraction ot' cotterpins, regardless of the extent to which their prongs are bent.

As is well known, the use of @otter-pins in automobile construction is very general and extensive, both for holding pivot-pins in place, and for anchoring bolts and nuts. Many ot these are in places difficult to reach with pliers, and even it' accessible, are not easily withdrawn by pliers without first straightening the prongs. The device which is the subject of this invention is designed to draw them easily, from almost any location, and at any desired angle.

The invention is fully disclosed in the description and claims following, reference being had to the accompanying drawing, in which z- Figure 1 is a side elevation ot a tool embodying my invention. Fig. 2 is a sectional side elevation of the same, showing the internal mechanism. Fig. 3 is a fragmentary elevation ot the same as seen from the handle end of the tool.

In the drawing, the numeral 5 denotes a bolt or pin, and 6 a cotter thrust through a hole in the bolt and with its tangs bent oppositely over the bolt to hold the pin securely inV place. The tool for stripping the Cotter out of the hole will now be described.

Atene end of a plunger 7 is formed a small hook 7a adapted to engage the eye of a Cotter, as shown. As the hook is so1netimes subjected to a rather severe strain, the plunger is in practice made ot' tool-steel, and the hook end suitably tempered for the work it haste do. In the present embodi-v mentof the tool the plunger' is cylindrical, and is mounted to slide in a tubular barrel S attached to a hand-hold or stock 9 analogous to a pistol-grip. This is herein shown as formed of drawn or pressed sheet metal, in the socket of which the barrel is secured, as by a screw 10. A crossapin 11 sliding under a cut-away part of the barrela prevents the plunger from turning, A spring Serial No. 737,091.

12 engaging the plunger Trictionally through a notch 8b in the barrel, serves to hold the plunger from slipping, at any de sii-ed position. For a considerable distance from the rear end, the plunger is serrated at 7b for engagement with a dog 13 pivoted at 13 to a hand-lever 14. This is pivoted at 15 between the cheeks 9 ot the stock, with which it cooperates like the handles of a pair of pliers. A spring 16 serves to throw out the lever to the normal position shown in Fig. 1, where it is stopped by the nose li striking the lined stock. A small tension spring 17 attached to a pin 18 and the tail oi' the dog draws the dog into engagement with the notches of the plunger. The dog is disengaged from the notches by a trigger 19, and may then be pushed forward to the limit ot' its forward position.

To remove a cotter, the operator, holding the tool as he would a pistol, hooks the plunger hook in the eye of the cotter to be drawn.` He then compresses the hand-lever shearwise in a series ot' successive movements. The first of these movements draws the tool up to the bolt, as shown in Fig. 2. By succeeding movements the cotter is stripped from the bolt, as indicated in the same ligure, the end of the barrel serving as an abutment against the bolt, and the cotter being drawn into the barrel in the oper v ation. This has the e'liect ot straightening the legs or tangs ol the cotter, so that itis in suitable condition to use again. EX- cept in the case ot' large cotters, it is not essential that the plunger pull in line with the hole in the bolt, as the tool will strip outa cotter, however clinched, and at a wide angle to the axis ot' the Cotter. This is a. matter oi great convenience, as the location of cotters, especially on automobiles,

is sometimes such as to make a straight-out.

pull impossible.

It is to be noted that when pulled, the cotter is within the barrel, until the operator chooses to release it. It has had no chance to iiy or fall, and so get lost. The tubular abutment thus has this advantage over an abutment that would guide, but not enclose the plunger.

As above indicated, the tool is restored to normal position by depressing the trigger, and pushing the plunger forward to the limit of its movement in this direction, when the cross-pin of the plunger strikes the shoulder' of the barrel. The pressure of the springlZnow 4holds the plungerfroni slipping back While the tool is. being v1nanipulated to engage another cotter. A

Having thus described my invention, I claim:

l. A Cotter-pin puller, comprising a hooked plunger', serrated for successive engagement of a dog, a tubular guide .therefor provided With a hand-hold disposed laterally of the guide, to'form a pistol grip, a lever pivoted to -the hand-hold, and a dog connecting with the lever to engage the seri-ations of the plunger.

2.A cotter-pinpuller, comprising Aa cy-V hndrical plunger-hooked at one end for engagement with the Cotter eye, serrated on one side, and provided with lateral projections, a tubular `guide therefor, having .Y guides for said projections, a hand-hold at- -to press it into engagement with the serrationsl of the plunger.

A Cotter-pin puller, comprising a.

hooked plunger, lserrated for the successive engagement of a dog, a tubular guide-barrel for the plunger, a pistolgrip shaped handheld stock attached to 'the barrel, a Vlever pivoted to the side-cheeks of said stock, and opposed to the hand-hold, a distending spring therefor, a dog attached to the short arni ofthe lever, and a yspring to press the dog into engagement with the serrated plunger.

ln testimony whereof I afIiX my signature.

HENRY D. DIRKS. 

